/*
opensl_io.c:
Android OpenSL input/output module header
Copyright (c) 2012, Victor Lazzarini
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
 * Neither the name of the <organization> nor the
 names of its contributors may be used to endorse or promote products
 derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef OPENSL_IO
#define OPENSL_IO

#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct _circular_buffer {
 char *buffer;
 int wp;
 int rp;
 int size;
} circular_buffer;

typedef struct opensl_stream {

 // engine interfaces
 SLObjectItf engineObject;
 SLEngineItf engineEngine;

// output mix interfaces
 SLObjectItf outputMixObject;

// buffer queue player interfaces
 SLObjectItf bqPlayerObject;
 SLPlayItf bqPlayerPlay;
 SLAndroidSimpleBufferQueueItf bqPlayerBufferQueue;
 SLEffectSendItf bqPlayerEffectSend;

// recorder interfaces
 SLObjectItf recorderObject;
 SLRecordItf recorderRecord;
 SLAndroidSimpleBufferQueueItf recorderBufferQueue;

 // buffers
 short *outputBuffer;
 short *inputBuffer;
 short *recBuffer;
 short *playBuffer;

circular_buffer *outrb;
 circular_buffer *inrb;

// size of buffers
 int outBufSamples;
 int inBufSamples;

double time;
 int inchannels;
 int outchannels;
 int sr;

} OPENSL_STREAM;

/*
 Open the audio device with a given sampling rate (sr), input and output channels and IO buffer size
 in frames. Returns a handle to the OpenSL stream
 */
 OPENSL_STREAM* android_OpenAudioDevice(int sr, int inchannels, int outchannels, int bufferframes);
 /*
 Close the audio device
 */
 void android_CloseAudioDevice(OPENSL_STREAM *p);
 /*
 Read a buffer from the OpenSL stream *p, of size samples. Returns the number of samples read.
 */
 int android_AudioIn(OPENSL_STREAM *p, float *buffer,int size);
 /*
 Write a buffer to the OpenSL stream *p, of size samples. Returns the number of samples written.
 */
 int android_AudioOut(OPENSL_STREAM *p, float *buffer,int size);
 /*
 Get the current IO block time in seconds
 */
 double android_GetTimestamp(OPENSL_STREAM *p);

#ifdef __cplusplus
};
#endif

#endif // #ifndef OPENSL_IO

